Level 3 Addition and Subtraction

I am learning to solve addition and subtraction at level 3.

1.  Maraea is saving to buy a cat.  In 3 weeks she has saved $9, $56 and $72.

Show how to work out how much she has saved altogether.

$9 +$56 + $ 72 = ?  answer 137

$56 + $ 72 =  128    50 + 70 = 120   6 + 2 = 8   120 + 8 = 128

128 + 9 = 137   

2.  Tom saves his money each month to buy a dog.  In 4 months he has saved $36, $78, $203, and $123.  Show how to work out how much he has saved altogether.

$36 + $78 + $ 203 + $123 = ? answer : $430

So I added the 203 with 123 which equals 326 I used place value to solve this problem.

$203 + $ 123 = $326    $200 + $100 =$300 -  $20 + 0 =$20   $3 + $3 = $6

$300 + $ 20 + $6 = 326   -  326 + 114 = $440

I added 36 with 78 which equals 114 I also used place value to solve this problem. Now I have to added 326 with 114.

$36 + $78 =     -   $70 + $30 = 100  - 6 + 8 = 14 - 100 + 14 = 114

3.   Te Ao is saving to buy a horse.  So far she has saved $17, $160, $72, and $148.  Show how to work out how much she has saved altogether.

$17 + $ 72 + $160 + $148 =

$160 + $148 = 308 - 100 + 100 =       $308 + $89 = 397

$17 + $72 = 89 - 10 + 70 = 80 - 7 + 2 = 9 - 80 + 9 = 89

4.  Petelo has $ 147 as a present.  He spent $78 at the shop.  How much has he got left?

$147 - $78 = ?, 78 + ? = 147, 78 + 69 = 147